DESI's first dataset maps 18.7 million celestial objects, aiding dark energy, galaxy, and universe expansion studies.

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The Sonoran Desert is a world like no other—an expansive, living landscape where rugged mountains, gigantic cacti, and an astonishing diversity of life create an ecosystem of wonder. Covering more ...

Where to taste Indigenous flavors, local ingredients, and modern Southwest cuisine in the U.S.'s first UNESCO City of ...

University of Arizona researchers are among a group of scientists who hope to discover what happened immediately after the Big Bang, when the universe expanded in a fraction of a ...

The Dark Energy Spectroscopic Instrument (DESI) is mapping millions of celestial objects to better understand dark energy—the ...

Main story over the next 7 days is the increasing temps through the weekend and into next week. Highs across southeast Arizona will be 15 to 20 degrees above normal, with Tucson nearing records.

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The DESI experiment shocked cosmologists with a hint that dark energy varies over time. Now, with more data, the conclusions hold up.